1887.] *'• ,[aenth. 



given below (c). The crystals occur as a coating upon porous quartz, are 

 barrel shaped prisms with basal i)1ane, from very minute to not over 4°™ 

 in size. Their coh)r is from pale green to brownish olive green, small 

 fragments are pale grayish green. 



d. Mr. J. C. Cooper presented to me a small fragment of another variety 

 from tlie same couniy. The crystals, not over 1"°^ in size, are of brownish- 

 red color, short liexagonal prisms with basal plane, on some a pyramid i3 

 slightly indicated. They cover a dark brown quartz. In some places is 

 a very minute crystalline black coating upon the quartz, which may be 

 descloizile. 



e. A ver}' interesting variety of a vanadate, which appears to be vanadi- 

 nite, has been observed by Mr. J. C. Cooper, at tlie McGregor mine. Grant 

 counlj'. New Mexico. The specimen, for which I am ind^bled to liim, con- 

 sists of an impure, friable, earthy hematite, which is coated with crystal- 

 lized calcito, frequently enveloping stalactites of the vanadium mineral, 

 which is again covered by finely crystalline calcite. After removing the 

 calcite by dilute acetic acid, the orange-yellow and orange-red stalactites 

 remain. Tliey are from 3 to 5""" in length, and up to about 1°^ thick. 

 When magniried GO diameters, they show a core of some other mineral 

 surrounded by scaly crystals of the vanadium mineral, the f )rm of which 

 could not be made out. A qualitative analysis showed lead oxide, vana- 

 dium pentoxide, and chlorine as the principal constituents, hence the con- 

 clusion that it may be vanadiuile. 



f. Prof. Albert H. Chester, of Hamilton College, N. Y., presented to 

 me a few fragments of a j'ellow ferruginous quartz with a pale brownish 

 crystalline coating, which appears to be descloizite, and upon it vanadinite 

 in very niinute crystals mixed with larger ones from 5 to G™" in length, 

 and 0.5 to 1.5""" in thickness, from Bald Mountain mine, Beaverhead Co., 

 Montana. These crystals are hexagonal prisms with basal plane, some 

 slightly barrel shaped, the greater portion of the crystals is of a dark 

 greenish brownish color, their ends capped with almost transparent ter- 

 minations. 



g. In his Re-examinatlon of American minerals. Am. Journ. Sc. [2], xx, 

 246, J. Lawrence Smith gives a description of vanadate of lead (descloi- 

 zite?) from the Wheatley mines near Phoenixville, Pa., and an analysis of 

 the same. He had only very imjiure material, mixed with a large percent- 

 age of wulfenite, etc., for examination, so that with the imperfect knowl- 

 edge which we then (1855) had of descloizite, he expressed his doubt 

 whether it was this species. I have examined a specimen which came 

 from the late Mr. Charles M. Wiieatley, at Phoenixville, and have no doubt 

 of the correctness of Dr. Smith's determination. 



